Spool and method of manufacturing spools



1,696,256 G. L. ROCK SPOOL AND METHOD OF MANUFACTURING SPOOLS Filed April 27, 1927' Patented Dec. 25, 1928.

UNITED STATES PATENT OFFICE.

GEORGE LYNDEN Boomer CICEBQVILLINOIS, ASSI GNOR TO WESTERN ELECTRIC COM- PANY, INCORPORATED, 01 NEW YORK, N. Y., A CORPORATION OF NEW YORK,

SPOOL AND METHOD OF MANUFACTURING SPOOLS.

Application filed April 27, 1927. Serial- No. 18?,001.

This invention relates to spools and a method of manufacturing spools, and more particularly to a spool comprising a drum or core having attached heads and a method of manufacturing such a spool.

This invention is particularly applicable to a spool structure for electromagnetic coils of the type wherein a tubular frame supporting the coils and composed of fibrous material, such as paper, interconnects a pair of apertured heads disposed at either end thereof and extends into the apertures, the tubular frame containing preferably a laminated core of magnetic material.

The objects of this invention are to provide spools of an. improy'ed type having attached heads and a method of manufacturing them wherein a strong inexpensive and simple spool structure results. a y

In accordance with the objects of this invention as practiced ,in} connection with the manufacture of s ools adaptable for electromagnetic coils o the type hereinbefore described, the heads upon the tubular fibrous core frame at either end thereof are attached. thereto by means of a headed pin inserted in an aperture formed in the head at an angle to and-opening into the aper- .ture provided for the tubular frame, with a portion of the Wall of each aperture lying tangent to the other, the pin being then driven along the aperture until it becomes wedged between the head and the frame, with one side of the head of the pin enibedded in the fibrous tubular frame and the shank of the pin also embedded in the abutting surfaces of the head of the spool and the frame. 7

Other objects and advantages of this in vention will more fully appear from the accompanying detailed description taken in connection with the accompanying drawing which illustrates one embodiment thereof, in which Fig. 1 is a perspective View of a completed spool applicable for supporting electro-magnetic coils and embodying the features of this invention produced by the.

improved method, showing the tubular frame with a laminated core therem and the two heads, but without any wlnding, and

Fig. 2 is a detail section on the line 2-2 thereof showing the attachment of the heads to the frame. h

Referring to the drawing, particularly to sta led for use.

Fig. 1 which illustrates a lcompletedspool for electromagnetic coils with the coil omitted, a tubular core frame 10 carries a head 11 at either end thereof. The frame 10 is. composed of fibrous material, such as paper, its aperture being filled with a plurality of core pieces 12 comprising strips of magnetic material, thus providing a laminated core. The heads ,11 are preferably made of fibrous material, such as wood,although any suitable material may be used, and are in the embodiment illustrated shown asbeing provided with a plurality of flat surfaces 13 to facilitate the mounting of the completed electro-magnetic coil when in- An aperture 1 1 provided axially in each of the heads 11 receives the opposite ends of the frame 10, the frame at the time of assemblage containing the core pieces 12 which are tightly fitted therein, the ends of the frame being tightly fitted within the apertures. and disposed flush with the outer endsurfaces of the heads. The improved method of rigidly securing the heads 11 to the frame 10 to positively prevent relative movement between the parts of the spool, whether it be of a rotary or longitudinal movement, comprises the following:

The heads 11 in addition to the axially disposed apertures 14; formed therein for the insertion of the ends of the frame 10 are each provided with an aperture 15 which extends inwardly from one of the flat surfaces thereof and at right angles to the longitudinal axis of the aperture 14, the inner end of the aperture 15 opening into the aperture 1 1. Theaperture 15 is of. smaller diameter than the aperture 14 and is disposed at one side of the longitudinal axis of the latter aperture, as clearly shown in Fig. 2, so that a portion ofv the wall of the aperture lies substantially tangent to a portion of the wall of the aperture 1 1. After the mounting of the heads '11 upon the opposite ends of theframelO,

the frame 10 when assembled with the heads 11, and thereafterupon being driven in or staked that it will become firmly wedged between the tangentially disposed portion of u the wall of the aperure 15 and the peripheral surface of the frame 10. The pin 16 is driven in until a portion of the peripheral edge of its head, as clearly indicated in Fig. 2, is forced into or embedded in the fibrous composition of the frame 10 and the wedging action of the shank of the pin is such that it is forced into or embedded in the material composingthe head 11, in the present instance wood, and the fibrous frame disposedat opposite ends thereof.

It will be apparent that the method as herein described of attaching the spool heads 11 to the core from 10 provides a a rigid spool structure wherein relative move ment between the respective parts thereof is greatly minimized and one in which no adhesive is used, thereby eliminating all tendency of corrosion occurring upon the wire COlllPl'lSlDglZlle coils and the laminated core, which might result from moisture contained in liquid adhesive.

Although the invention as herein illustrated and described is particularly well adapted for use in connection with spool structures for supporting electromagnetic coils, it should be understood that the novel features thereof are capable of use in spool structures forother purposes and should be limited only by the scope of theappended claims.

\Vhat is claimed is:

1. The method of manufacturing spools having attached heads, which consists in forming an aperture in a head for the insertion of a core, forming a second aperture in the head at an angle to the longitudinal axis of the first aperture and extending only to the periphery of the first aperture and at one point thereof, inserting the core in the first aperture, inserting a member in the second aperture, and then causing the member to be driven in a direction at an angle to the longitudinal axis of the second aperture until it is wedged between abutting surfaces to thereby rigidly unite the head and the core.

2. A spool comprising a core, a head provided with an aperture for receiving the core and a second aperture disposed at an angle to the longitudinal axis of the first aperture and extending only to the periph cry of the first aperture and at one point thereof, a portion of the wall of the second aperture lying tangent to a portion of the wall of the first aperture, and a pin of less diameter than that of the second aperture into which it is entered, positioned between abutting surfaces of the core and thehead at the periphery of the core, and thereby rigidly uniting the head and the core and at an angle to the longitudinal axis of the second aperture.

In witness whereof, I hereunto subscribe by name this 14 day of April, A. D. 1927.

GEORGE LYNDEN ROCK. 

